Bathtub & Shower Fiberglass Repair Kit with White Gelcoat

A proper structural fix for a cracked, soft, or holed fiberglass tub or shower pan, not a cosmetic paint-over. Most bathtub repair kits are a tiny tube of filler that cracks again in a month because the flexing floor underneath was never reinforced. This kit repairs the tub the way a boatyard repairs a hull: glass and resin for strength, then a full quart of true white gelcoat that cures hard, glossy, and waterproof.

What is in the kit:

• 1 Quart Silmar 249 clear polyester laminating resin
• MEKP hardener (catalyzes both the resin and the gelcoat)
• 1 yard x 38" of 1.5oz chopped strand mat
• 1 Quart pure white gelcoat with wax, cures tack-free to a gloss finish
• 1 Quart fumed silica thickener, for filling cracks and chips
• Prep & Fair sandpaper 6-pack (120 through 400) plus Finish & Polish 6-pack (600 through 3000) for the full wet-sand to gloss progression
• Chip brush, 4 mixing cups, 4 mixing sticks, plastic spreader, nitrile gloves

How the repair works: reinforce the flexing area from above (or below if accessible) with resin and mat, fill the crack with silica-thickened resin, then topcoat with the white gelcoat and wet sand through the grits to blend the gloss into the surrounding tub.

Works on fiberglass and most acrylic-over-fiberglass tubs, shower pans, and utility sinks. With a full quart of resin and a full quart of gelcoat, there is enough here to repair and resurface an entire tub floor, not just patch one crack.